Examples

Example - Computing points based on position of finish

ARRAYINDEXOF - Returns the index value of an array for the specified value, searching from left to right. See ARRAYINDEXOF Function.

ARRAYRIGHTINDEXOF - Returns the index value of an array for the specified value, searching from right to left. See ARRAYRIGHTINDEXOF Function.

Source:

The following set of arrays contain results, in order, of a series of races. From this list, the goal is to generate the score for each racer according to the following scoring matrix.

Place

Points

1st

30

2nd

20

3rd

10

Last

-10

Did Not Finish (DNF)

-20

Results:

RaceId

RaceResults

1

["racer3","racer5","racer2","racer1","racer6"]

2

["racer6","racer4","racer2","racer1","racer3","racer5"]

3

["racer4","racer3","racer5","racer2","racer6","racer1"]

4

["racer1","racer2","racer3","racer5"]

5

["racer5","racer2","racer4","racer6","racer3"]

Transformation:

Note that the number of racers varies with each race, so determining the position of the last racer depends on the number in the event. The number of racers can be captured using the following:

Transformation Name

New formula

Parameter: Formula type

Single row formula

Parameter: Formula

ARRAYLEN(RaceResults)

Parameter: New column name

'countRacers'

Create columns containing the index values for each racer. Below is the example for racer1:

Transformation Name

New formula

Parameter: Formula type

Single row formula

Parameter: Formula

ARRAYINDEXOF(RaceResults, 'racer1')

Parameter: New column name

'arrL-IndexRacer1'

Transformation Name

New formula

Parameter: Formula type

Single row formula

Parameter: Formula

ARRAYRIGHTINDEXOF(RaceResults, 'racer1')

Parameter: New column name

'arrR-IndexRacer1'

You can then compare the values in the two columns to determine if they are the same.

NOTE: If ARRAYINDEXOF and ARRAYRIGHTINDEXOF do not return the same value for the same inputs, then the value is not unique in the array.

Since the points awarded for 1st, 2nd, and 3rd place follow a consistent pattern, you can use the following single statement to compute points for podium finishes for racer1: computing based on the value stored for the left index value:

Transformation Name

Conditional column

Parameter: Condition type

if...then...else

Parameter: If

{arrayL-IndexRacer1} < 3

Parameter: Then

(3 - {arrayL-IndexRacer1}) * 10

Parameter: Else

0

Parameter: New column name

'ptsRacer1'

The following transform then edits the ptsRacer1 to evaluate for the Did Not Finish (DNF) and last place conditions:

Transformation Name

Edit column with formula

Parameter: Columns

ptsRacer1

Parameter: Formula

IF(ISNULL({arrayL-IndexRacer1}), -20, ptsRacer1))

You can use the following to determine if the specified racer was last in the event: